Note: Descriptions are shown in the official language in which they were submitted.
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GR 92 P 1773
INDUCTIVE ELECTRIC COMPONENT
Backaround of the Invention:
Field of the Invention:
The present invention relates to an inductive electric
component, in particular an electric transformer, including a
coil body which has contact pin strips integrally formed onto
coil body flanges that define a winding space; a two-part
magnet core having halves which can be pushed together on the
coil body in such a way that they engage the coil body with
center bosses and rest both on the coil body flanges and the
contact pin strips; and a spring cap which can be slipped
onto the magnet core located on the coil body for retaining
the magnet core halves on the coil body, the cap having a
yoke being concave at least in its middle region, legs on two
opposite sides and spring hoops on two other opposite sides;
wherein with the spring cap slipped on, the concave region
engages the outside of the magnet core facing away from the
contact pin strips, the legs rest on two opposite sides on
outsides Or the magnet core that are perpendicular to the
contact pin strips, and the spring hoops engage two further
- oppo-lte sides of the magnet core.
Such inductive components are known, for ~nstance, $rom
Siemens Data Book 1990/91, "Ferrite und Zubehor" [Ferrites
2 ~
and Accessories], particularly pp. 321-323 as well as 338 and
339.
One embodiment of a typical transformer model has a coil body
and a so-called EP ferrite core, in the form of two core
halves that can be mounted on the coil body. A further
explanation thereof can be gathered from the description of
the drawing, for the sake of simplicity. In such a device, a
coil body has a winding space defined by two coil body
flanges with a cylindrical through hole for receiving center
bosses of EP core halves. The coil body also has two inte-
grally formed-on contact pin strips with contact pins.
Two EP core halves with center bosses and core legs can be
slipped onto the coil body in such a way that the center
bosses engage the cylindrical through hole and the core legs
are seated on the contact pin strips.
To that extent, the transformer model in question is general-
ly known, and reference may be made, for instance, to the
v~ew shown on page 323 of the aforementioned Siemens Data
Book.
In the known transformer model with an EP core, the core
halve~ are held on the coil body by means of a retainer
device that is formed by two separate parts, namely a hoop
and a clamp. Both the hoop and the clamp are U-shaped in
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principle. The hoop has one detent protrusion on the outside
of each of the two legs of the U-shaped element, while the
clamp has one recess adapted to each of the detent protru-
sions of the hoop, on each of the legs of the U-shaped
element.
The hoop and the clamp are each slipped from one side in the
direction of the central axis of the through hole in the coil
body and the center boss of the core halves onto the assem-
bled unit including the coil body and the core halves, in the
course of which the detent protrusions of the hoop then lock
into place in the recesses in the clamps. Since the yoke of
the clamp is constructed in such a way as to be concave and
thus exerts an additional spring action, the core halves are
pushed together in the direction of the aforementioned axis
on the coil body and held. Moreover, the hoop seated on one
core half has two legs being oriented inwardly and engaging
the core half. They assure a certain retention at right
angles to the aforementioned axis (which is also the magnetic
i axis of the transformer).
An embodiment of the type explained above is not completely
atisfactory in terms of the retention of the core halves on
the coil body. However, although the hoop and the clamp
assure good retention in the direction of the magnetic axis,
they do not always assure adequate retention at right angle~
to that axis, so that the core halves may still have a
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certain amount of play on the coil body, which can have a
negative effect on the electromagnetic properties of the
transformer.
Another known version of a typical transformer model has a
so-called Q core, in the form of two core halves. With
respect to the coil body and the ferrite core, this model
generally matches the model with the EP core described above.
In order to retain the two core halves on the coil body, a
covering tab is provided, which is slipped from above onto
this unit including the coil body and the core, with the core
halves placed on the coil body. In the direction of the
magnetic axis, the covering cap has two resilient legs on
each of the opposite sides, and those legs engage the out-
sides of the core halves and press them together on the coil
body in the direction of the magnetic axis. The problem
addressed above of possibly inadequately fastening the core
halves at right angles to the magnetic axis on the coil body
still exists in that case.
Summarv of the Invention:
It i~ accordingly an object of the invention to provide an
inductive electric component, which overcomes the
hereinafore-mentioned disadvantages of the heretofore-known
devices of this general type and which has a capability of
adequately fasteninq a magnetic core on a coil body both in a
magnetic axis and at right angles thereto.
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With the foregoing and other objects in view there is provid-
ed, in accordance with the invention, an inductive electric
component, in particular an electric transformer, comprising
a coil body having coil body flanges defining a winding
space, and contact pin strips integrally formed onto the coil
body flanges, the contact pin strips having extensions and
having free ends with undercuts formed therein being limited
outwardly by the extensions; a two-part magnet core having
opposite outer surfaces, an outer surface facing away from
the contact pin strips, and halves with center bosses to be
pushed together on the coil body with the center bosses
engaging the coil body and resting on the coil body flanges
and on the contact pin strips; and a spring cap to be slipped
onto the magnet core disposed on the coil body for retaining
the magnet core halves on the coil body, the cap having a
yoke with a middle region and opposite sides, the yoke being
concave at least in the middle region, and the yoke having
legs on two of the opposite sides and spring hoops on two
others of the opposite sides, the legs each having detent
protrusions locking into the undercuts with the spring cap
d ipped on; and with the spring cap slipped on, the concave
region engaging the outer surface of the magnet core facing
away rrom the contact pin strips, the legs resting on two of
the oppo~ite outer surfaces of the magnet core being perpen-
dicular to the contact pin strips, and the spring hoops
ngaging two others o~ the opposite outer surface~ o the
aagnet coree
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In accordance with another feature of the invention, the legs
have free ends, the legs have notches formed therein in the
vicinity of the free ends forming the detent protrusions, and
the notches have dimensions corresponding to dimensions of
the contact pin strips.
In accordance with a further feature of the invention, the
legs have a surface, and the detent protrusions are inclined
outwardly from the surface of the legs.
In accordance with a concomitant feature of the invention,
the legs have recesses formed therein.
Other features which are considered as characteristic for the
invention are set forth in the appended claims.
Although the invention is illustrated and described herein as
embodied in an inductive electric component, it is neverthe-
less not intended to be limited to the details shown, since
various modifications and structural changes may be made
therein without departing from the spirit of the invention
~nd within the scope and range of equivalents of the claims.
The construction and method of operation of the invention,
however, together with additional objects and advantages
thereo~ will be best understood from the following
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description of specific embodiments when read in connection
with the accompanying drawing.
Brief Description of the Drawinq:
The figure is an exploded view of an inductive electric
component according to the invention.
DescriDtion of the Preferred Embodiments:
Referring now to the single figure of the drawing in detail,
there is seen a coil body 10 which has a winding space
defined by two coil body flanges 11, 12, with a cylindrical
through hole 13 for receiving center bosses 21 of EP core
halves 20 to be described below. The coil body 10 also has
two integrally formed-on contact pin strips 14, 15 with
contact pins 16.
The two EP core halves 20 with the center bosses 21 and core
legs 22 can be slipped onto the coil body 10 in such a way
that the center bosses 21 engage the cylindrical through hole
13, and the core legs 22 are seated on the contact pin ~trips
14, 15.
An xemplary embodiment of the invention includes the coil
body 10 and the magnet core with the two magnet core halves
20 discussed above. In order to fasten the magnet core
halve~ 20 to the coil body 10, a ~pring cap 30 which is
con~tructed in accordance with the invention is provided in
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combination with a special embodiment of the contact pin
strips 14, 15 of the coil body 10, that is adapted to it.
The spring cap 30 has a yoke 31, which at least in its middle
region 32 is concavely constructed and as a result is provid-
ed with an additional spring action. Legs 33 are provided on
two opposite sides of this yoke 31 and have detent protru-
sions 34 which are preferably inclined outwardly from the
surface of the legs 33. These detent protrusions 34 are
formed by providing the region of the free ends of the legs
33 with notches 35 having dimensions that match those of the
contact pin strips 14, 15 of the coil body 10. The side of
the legs 33 opposite from the detent protrusions 34 continue
in the form of grounding pins 36.
Spring hoops 37 are provided on the yoke 31 in a plane at
right angles to the legs 33 of the spring cap 30.
As an adaptation to the detent protrusions 34 of the spring
cap 30, the coil body 10 has undercuts 18 on free ends o~ the
contact pin strips 14, 15. The undercuts 18 are limited on
the out~ide by extensions 17.
Once the magnet core halves 20 have been slipped onto the
coil body 10, in such a way that the center bosses 21 engage
the cylindrical through hole 13 and the outer legs 22 are
~eated on the contact pin strips 14, 15, i~ the spring cap 30
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is then slipped from above onto the unit including the coil
body 10 and the magnet core 20, 21, 22, then the detent
protrusions 34 engage the undercuts 18. As a result, the
core halves 20 are retained on the coil body 10 in the
direction at right angles to the magnetic axis, that is the
central axis extending through the through hole li and the
center bosses 21. In the direction of the magnetic axis, the
core halves 20 are held together by the spring hoops 37. In
this way, the core halves 20 are held firmly on the coil body
10 in two directions at right angles to one another, so that
it is no longer possible for impairments to the electromag-
netic properties of the inductive component to arise.
In order to further improve stability, recesses 38 are
provided in the legs 33 of the spring cap 30, by way of which
the spring cap 30 can be adhesively connected to the core
halves 20.
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